Linux Cgroup v2 introduces significant improvements over v1, including a unified hierarchy, better resource accounting, and pressure stall information (PSI) for proactive resource management. This guide covers the core mechanisms for CPU and memory isolation, such as cpu.weight, cpu.max, memory.high, and memory.max. It also provides practical tuning advice for production environments, including how to set limits to avoid OOM kills while maintaining performance. Key topics include understanding PSI metrics, configuring cgroup controllers, and debugging resource contention. For engineers running containerized workloads or multi-tenant services, mastering Cgroup v2 is essential for stable and efficient infrastructure. The guide emphasizes real-world scenarios and common pitfalls, making it a valuable reference for SREs and platform engineers.
A comprehensive guide to Linux Cgroup v2 CPU and memory isolation, including PSI and production tuning strategies.